Potomac River Generating Station

Potomac River Generating Station is a coal-fired power station owned and operated by Mirant in Alexandria, Virginia.

Plant Data

 * Owner: Mirant Potomac River LLC
 * Parent Company: Mirant
 * Plant Nameplate Capacity: 514 MW (Megawatts)
 * Units and In-Service Dates: 92 MW (1949), 92 MW (1950), 110 MW (1954), 110 MW (1956), 110 MW (1957)
 * Location: 1400 North Royal St., Alexandria, VA 22314
 * GPS Coordinates: 38.820278, -77.041389
 * Coal Consumption:
 * Coal Source:
 * Number of Employees:

Mirant Clean Air Settlement
On May 8, 2006 Mirant Mid-Atlantic (Mirant) agreed to eliminate nearly 29,000 tons of harmful pollution each year that is produced by its four coal-fired electrical plants in Maryland and Virginia as a result of allegations that the company had violated New Source Review requirements of the Clean Air Act. The U.S. EPA, Department of Justice and the states of Virginia and Maryland worked on a joint settlement agreement, which sought to reduce the output of nitrogen oxides (NOx) from the four plants.

Under settlement terms, Mirant will cap NOx emissions on a system-wide basis from its Chalk Point Generating Station in Maryland, Dickerson Generating Station in Maryland, Morgantown Generating Station in Maryland, and its Potomac River Generating Station in Virginia. To meet these objectives Mirant will install pollution control equipment at its Potomac River and Morgantown power plants, and may also install controls at their other sites. According to Mirant, the company will be installing Flue gas desulfurization (scrubbers) to reduce sulfur dioxide (SO2) that will be operable by 2010. The EPA notes that Mirant will install and operate two Selective Catalytic Reduction devices to control for NOx emissions at its Morgantown facility, as well as Separated Over-Fire Air technology at the Potomac plant.

Mirant also paid a $500,000 civil penalty, which was divided between Virgina and the U.S. government. Additionally, Mirant will spend at least $1 million on nine separate projects to reduce fine particulate matter (PM) from its Potomac River Generating Station.

"The reductions in NOx emissions required by this settlement will result in general improved air quality throughout the metropolitan area and the surrounding region," said Sue Ellen Wooldridge, assistant attorney general for the Justice Department's Environment and Natural Resources Division. "Today's settlement is evidence of the continued progress that we are achieving through the cooperative enforcement efforts of federal and state agencies."

NOx contributes to the formation of acid rain and also increases low-level ozone, which causes smog, and fine PM causes haze.

2011: permit violations found at plant
On May 6, 2011, the Virginia Department of Environmental Quality determined that the plant must pay $275,500 in civil penalties to the state for numerous permit violations, including excessive visible emissions and not turning in paperwork on emissions monitoring. The fine was part of a consent order with GenOn Energy, which merged with Mirant in December 2010. The facility was determined "to not be in compliance with several conditions of their state-operating permit issued on July 31, 2008,” according to the DEQ. The violations included operating failures to control emissions, using inappropriate fuel and improper emissions controls, among other violations. Several of the new monitoring systems were installed as part of an agreement among the city, the plant and community activists’ work, and yet the new systems had operational failures. Many of the administrative steps in the consent order were designed to get the system working properly.

Emissions Data

 * 2006 CO2 Emissions: 1,776,053 tons
 * 2006 SO2 Emissions:
 * 2006 SO2 Emissions per MWh:
 * 2006 NOx Emissions:
 * 2005 Mercury Emissions:

Death and disease attributable to fine particle pollution from Potomac River Station
In 2010, Abt Associates issued a study commissioned by the Clean Air Task Force, a nonprofit research and advocacy organization, quantifying the deaths and other health effects attributable to fine particle pollution from coal-fired power plants. Fine particle pollution consists of a complex mixture of soot, heavy metals, sulfur dioxide, and nitrogen oxides. Among these particles, the most dangerous are those less than 2.5 microns in diameter, which are so tiny that they can evade the lung's natural defenses, enter the bloodstream, and be transported to vital organs. Impacts are especially severe among the elderly, children, and those with respiratory disease. The study found that over 13,000 deaths and tens of thousands of cases of chronic bronchitis, acute bronchitis, asthma, congestive heart failure, acute myocardial infarction, dysrhythmia, ischemic heart disease, chronic lung disease, and pneumonia each year are attributable to fine particle pollution from U.S. coal plant emissions. These deaths and illnesses are major examples of coal's external costs, i.e. uncompensated harms inflicted upon the public at large. Low-income and minority populations are disproportionately impacted as well, due to the tendency of companies to avoid locating power plants upwind of affluent communities. To monetize the health impact of fine particle pollution from each coal plant, Abt assigned a value of $7,300,000 to each 2010 mortality, based on a range of government and private studies. Valuations of illnesses ranged from $52 for an asthma episode to $440,000 for a case of chronic bronchitis.

Table 1: Death and disease attributable to fine particle pollution from Potomac River Station
Source: "Find Your Risk from Power Plant Pollution," Clean Air Task Force interactive table, accessed February 2011

Citizen groups

 * Appalachian Voices
 * Blue Ridge Earth First
 * Concerned Citizens of Giles County
 * Do Something Charlottesville
 * Chesapeake Climate Action Virginia
 * Mountain Justice Blacksburg
 * Sierra Club Virginia Chapter
 * Southern Appalachian Mountain Stewards
 * Virginia Tech Beyond Coal
 * Wise Energy for Virginia

External Resources

 * Existing Electric Generating Units in the United States, 2005, Energy Information Administration, accessed Jan. 2009.
 * Environmental Integrity Project, "Dirty Kilowatts: America’s Most Polluting Power Plants", July 2007.
 * Facility Registry System, U.S. Environmental Protection Agency, accessed Jan. 2009.
 * Carbon Monitoring for Action database, accessed Feb. 2009.

Related SourceWatch Articles

 * Existing U.S. Coal Plants
 * Virginia and coal
 * Mirant
 * United States and coal
 * Global warming
 * EPA Coal Plant Settlements